/Engine/Source/Runtime/AugmentedReality/Public/ARBlueprintLibrary.h
For a point P in the AR local space, whose location and rotation are "OriginLocation" and "OriginRotation" in the world space modify the alignment transform so that the same point P will be transformed to the origin in the world space. : whether "OriginLocation" and "OriginRotation" are specified in UE4's world space or AR system's local space. : if set, only the yaw roation of the alignment transform will be modified, pitch and roll will be zeroed out.
static void SetARWorldOriginLocationAndRotation ( FVector OriginLocation, FRotator OriginRotation, bool bIsTransformInWorldSpace, bool bMaintainUpDirection )